Steelmaking converter smoke-gas washing water quality controlling method

A technology for steelmaking converter and water quality control, which is applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., to ensure normal production, save new water, and eliminate pollution sources.

Inactive Publication Date: 2008-07-30
WUHAN IRON & STEEL (GROUP) CORP
View PDF0 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is for existing Na 2 CO 3 The application of the softening method in the control of the water quality of the converter flue gas washi

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] According to the present invention, the water quality of the converter flue gas washing water of a certain steel plant is detected, the P alkali value in the converter flue gas washing water water is 8.20mmol / L, the M alkali value is 24.80mmol / L, and the total hardness is 0.36mmol / L L, the calcium ion concentration is 6.41mg / L. After adding NaOH to the converter flue gas washing water, the P alkali value in the converter flue gas washing water is 16.80mmol / L, and the M alkali value is 30.40mmol / L, reaching 2P>M and P≠M. At this time, the converter flue gas The total hardness of the gas washing water is 0.20mmol / L, and the calcium ion concentration is 3.21mg / L, meeting the softening requirements of the converter flue gas washing water of this steel plant.

Embodiment 2

[0031] According to the present invention, the water quality of the converter flue gas washing water of a certain steel plant is detected, the P alkali in the converter flue gas washing water water is 8.00mmol / L, the M alkali is 20.80mmol / L, and the total hardness is 0.34mmol / L, The calcium ion concentration was 6.41mg / L. After adding NaOH to the converter flue gas washing water, the P alkali value in the converter flue gas washing water is 17.60mmol / L, and the M alkali value is 31.10mmol / L, reaching 2P>M and P≠M. At this time, the converter flue gas The total hardness of the gas washing water is 0.14mmol / L, and the calcium ion concentration is 4.01mg / L, meeting the softening requirements of the converter flue gas washing water of this steel plant.

Embodiment 3

[0033]According to the converter flue gas washing water quality control method, the water quality of the converter flue gas washing water in a steel plant was tested. The P alkali value in the converter flue gas washing water water was 0, the M alkali value was 7.10mmol / L, and the total hardness was 0.42mmol / L, calcium ion concentration is 7.10mg / L. After adding NaOH to the converter flue gas washing water, the P base value in the converter flue gas washing water is 9.70mmol / L, the M base value is 15.20mmol / L, reaching 2P>M and P≠M, the converter flue gas washing water The total hardness is 0.08mmol / L, and the calcium ion concentration is 1.60mg / L, meeting the softening requirements of the converter flue gas washing water of this steel plant.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Total hardnessaaaaaaaaaa
Hardnessaaaaaaaaaa
Login to view more

Abstract

The invention relates to a method for regulating the quality of washing water for flue gas in a steel-making converter, which is an optimized regulation proposal of softening method of sodium carbonate by analyzing and determining the relationship between regulation of water alkalinity and hardness. The method for regulating the quality of washing water for flue gas in the converter comprises the following steps: when two times of a P alkalinity value is smaller than/equal to a M alkalinity value, NaOH is added into the washing water for flue gas in the converter, until two times of the P alkalinity value is larger than the M alkalinity value, which means 2P is larger than M and P is not equal to M; when P is equal to M, the sodium carbonate is added into the water, wherein, the P alkalinity value is the alkalinity measured by applying phenolphthalein as indicator and is phenolphthalein alkalinity, and the M alkalinity value is the alkalinity measured by applying methyl orange as indicator and is the total alkalinity. The system of washing water for flue gas in the converter adopts a manner of total recycle. The method can cause the quality of the washing water for flue gas in the converter to reach good softening effect and can solve the problem of scaling in the system of washing water for flue gas in the converter, which adopts total recycle with zero discharge to reduce pollution.

Description

technical field [0001] The invention relates to the field of water treatment of flue gas washing water of a steelmaking converter in the metallurgical industry. Background technique [0002] Sodium carbonate softening method is a commonly used method to treat steelmaking converter flue gas washing water, but it encounters problems in practical application. In many cases, a large amount of sodium carbonate agent is added to the system and the softening effect is still not achieved, resulting in the problem of scaling in the water system. The reason is that there is a large amount of HCO in the converter flue gas washing water 3 - , HCO 3 - with Ca in water 2+ , Mg 2+ Generate Ca(HCO 3 ) 2 , Mg(HCO 3 ) 2 , while Ca(HCO 3 ) 2 , Mg(HCO 3 ) 2 Soluble in water, it is difficult to form precipitates and remove them in the sedimentation tank. Once it passes through the water treatment process, such as precipitation, cooling, CO in water 2 The escape, part of the HCO 3...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C02F9/04
Inventor 习明安李英王伟
Owner WUHAN IRON & STEEL (GROUP) CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap